hadoop-common-user mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From Boyu Zhang <boyuzhan...@gmail.com>
Subject Re: Datanode Cannot Connect To The Server
Date Fri, 17 Jul 2009 19:44:07 GMT
Thank you for the reply.

My problem has been solved. It is the problem with firewall. The firewall
blocks all the initiate connection request from other machines, I stop the
firewall and everything works fine. I really should check that at the
beginning.

Thank you all so much for replying.

Boyu

On Fri, Jul 17, 2009 at 1:55 AM, jason hadoop <jason.hadoop@gmail.com>wrote:

> If your namenode is not binding to the ethernet port address, but only to
> the localhost, your datanode will never be able to connect to it.
>
> I vaguely remember that if the hostname of the node is found on the
> localhost line in /etc/hosts, that this may happen.
>
> On Thu, Jul 16, 2009 at 1:54 PM, Boyu Zhang <boyuzhang35@gmail.com> wrote:
>
> > Thank you for your suggestion.
> >
> > I have done that plenty of times, and every time I delete the pids and
> the
> > files /tmp/hadoop-name that namenode formate genrated. But I got the same
> > error over and over.
> >
> >
> > I found out that after I start-dfs.sh, I check the netstat -pnl(from the
> > master),  there is a process listening on port 9000 with local address
> > 127.0.0.2. But in the log file of the failed data node , it kept trying
> to
> > connect to IP:9000 where IP is the actual IP of the master machine. And I
> > tried to use IP address in stead of machine name, still not work. I am
> > still
> > trying to figure out why. It seems that not lots of people are having
> this
> > problem, but I keep getting this error.
> >
> >
> > Thanks a lot!
> >
> >
> > On Thu, Jul 16, 2009 at 11:15 AM, zhang jianfeng <zjffdu@gmail.com>
> wrote:
> >
> > > It seems that your datanode is dead. My suggestion is that you can
> > reformat
> > > the namenode, and restart the cluster.
> > >
> >
>
>
>
> --
> Pro Hadoop, a book to guide you from beginner to hadoop mastery,
> http://www.amazon.com/dp/1430219424?tag=jewlerymall
> www.prohadoopbook.com a community for Hadoop Professionals
>

Mime
  • Unnamed multipart/alternative (inline, None, 0 bytes)
View raw message